Saturday
August 2, 2014

# Homework Help: Math: Calculus

Pre Calculus
Solve the inequality sinx>square root x.
Saturday, May 3, 2014 at 2:47pm

Calculus
he rate of growth of the profit from an invention is approximated by P'(x)=xe^-x^2, where x represents time measured in years. The total profit in year 1 that the invention is in operation is $15,000. Find the total profit function. I know the answer is +.199 but how? I ... Friday, May 2, 2014 at 10:37am Physics/Calculus It takes a force of 21,714lb to compress a coil spring assembly on a New York City Transit Authority subway car from its height of 8in to its fully compressed height of 5in. A. What is the assemblys force constant? B. How much work does it take to compress the assembly the ... Friday, May 2, 2014 at 9:43am Calculus An electric elevator cable with a motor at the top has a multistrand cable weighing 4.5lb/ft. When the car is at the first floor, 180ft of cable are pulled out, and effectively 0ft are out when the car is at the top floor. How much work does the motor do just lifting the cable... Friday, May 2, 2014 at 9:41am Calculus/Physics A spring has a natural length of 10in. An 800lb force stretches the spring to 14in. A. Find the force constant B. How much work is done in stretching the spring from 10 to 12 inches? C. How far beyond its natural length will a 1600lb force stretch the spring. Friday, May 2, 2014 at 9:39am Calculus/Physics It took 1800J of work to stretch a spring from its natural length of 2m to a length of 5m. Find the spring's force constant. Friday, May 2, 2014 at 9:38am Calculus Consider the differential equation dy/dx=xy-y. Find d^2y/dx^2 in terms of x and y. Describe the region in the xy plane in which all solutions curves to the differential equation are concave down. Thursday, May 1, 2014 at 10:44pm Calculus Help and Check find the derivative of the function integral from cosx to sinx (ln(8+3v)dv) y'(x)= (sin(8+3((sin(x)))+x)+sin(8+3sin(x)-x))/​2 Is this the right answer????? Thursday, May 1, 2014 at 8:49pm calculus help use the midpoint rule with the given value of n to approximate the integral. round the answer to four decimal places. integral 0 to pi/2 2cos^3(x)dx, n=4 M4=???? Thursday, May 1, 2014 at 8:44pm calculus help find the derivative of the function integral from cosx to sinx (ln(8+3v)dv) Thursday, May 1, 2014 at 8:03pm Calculus Help Please Urgent!!! Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 3 s. The maximum rate of air flow into the lungs is about 0.3 L/s. This explains, in part, why the function f(t) = (3/10)sin(2πt/3) has often been used ... Thursday, May 1, 2014 at 7:27pm calculus help find the derivative of the function. integral cos(x) to sin(x) ((ln(8+3v))dv) Thursday, May 1, 2014 at 6:50pm Calculus Help Find the values of c such that the area of the region bounded by the parabolas y = 4x^2 − c^2 and y = c^2 − 4x^2 is 256/3. (Enter your answers as a comma-separated list.) Thursday, May 1, 2014 at 5:39pm Calculus Help Use calculus to find the area A of the triangle with the given vertices. (0, 0), (3, 1), (1, 8) A = ???? Thursday, May 1, 2014 at 5:24pm pre calculus 4+7i divided by 2 (problem is written as a fraction) 4+7i _________ 2 Thursday, May 1, 2014 at 2:06am calculus 1 find the cubic function,f(x)=ax^3+bx^2+cx^d , has local maximum value of 3, at x=-2 and local minimum value of 0, at x=1. Thursday, May 1, 2014 at 1:44am pre calculus Express statement as an equation. Use the given information to find the constant proportionality z varies inversely as t. If t  3, then z  5. Thursday, May 1, 2014 at 1:28am pre calculus You have a$50 coupon from the manufacturer good for the purchase of a cell phone. The store where you are purchasing your cell phone is offering a 20% discount on all cell phones. Let x represent the regular price of the cell phone. (a) Suppose only the 20% discount applies. ...
Thursday, May 1, 2014 at 1:12am

Calculus
A fence 8 feet tall runs parallel to a tall building at a distance of 6 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
Wednesday, April 30, 2014 at 11:16pm

Calculus
Find the point P on the graph of the function y=\sqrt{x} closest to the point (2,0)
Wednesday, April 30, 2014 at 8:27pm

Calculus
A Norman window has the shape of a semicircle atop a rectangle so that the diameter of the semicircle is equal to the width of the rectangle. What is the area of the largest possible Norman window with a perimeter of 33 feet?
Wednesday, April 30, 2014 at 8:21pm

Calculus
A fence is to be built to enclose a rectangular area of 310 square feet. The fence along three sides is to be made of material that costs 4 dollars per foot, and the material for the fourth side costs 12 dollars per foot. Find the dimensions of the enclosure that is most ...
Wednesday, April 30, 2014 at 7:35pm

Calculus
Find the point on the line -4x+7y+3=0 which is closest to the point(-5,-5)
Wednesday, April 30, 2014 at 7:30pm

Prove that the integral on the interval [a,b] of x is equal (b^2-a^2)/2 integral a to be (x)dx = (b^2-a^2)/2 using the definition of a Definite Integral. This is the limit of a sum approach. show steps please!!! Thank you!!!
Wednesday, April 30, 2014 at 6:59pm

Calculus
if the work required to stretch a spring 1 ft beyond its natural length is 12 ft-b, how much work is needed to stretch 9 inches beyond its natural length?
Wednesday, April 30, 2014 at 12:28am

Calculus Help and Check
The marginal cost of manufacturing x yards of a certain fabric is C'(x) = 3 − 0.01x + 0.000012x2 (in dollars per yard). Find the increase in cost if the production level is raised from 2000 yards to 4000 yards. $186,000 Tuesday, April 29, 2014 at 8:45pm calculus 3x^2-75/6x+30 Tuesday, April 29, 2014 at 7:37pm calculus x^2-9/8x-24 Tuesday, April 29, 2014 at 7:36pm calculus (x^2-1)/5x+5 Tuesday, April 29, 2014 at 7:34pm calculus 8x^3 + 27 divided by 4x^2 + 12x +9 Tuesday, April 29, 2014 at 6:44pm calculus 9x^3+5x-8 divided by 3x-2 Tuesday, April 29, 2014 at 6:40pm calculus 24x^2-10x-21/32^2-18 Tuesday, April 29, 2014 at 2:37pm calculus (x^2-4x+6)(x-3)^-3 Tuesday, April 29, 2014 at 2:34pm calculus 9x^3+5x-8/3x-2 Tuesday, April 29, 2014 at 2:33pm calculus (2y^3-3y^2+3y-4)/(y-2) Tuesday, April 29, 2014 at 2:32pm CALCULUS The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ... Tuesday, April 29, 2014 at 2:32pm calculus x^2+5X/(x^3-25x)(x-5)^-1 Tuesday, April 29, 2014 at 2:30pm calculus 8x^3+27/4x^2+12x+19 Tuesday, April 29, 2014 at 2:29pm calculus 24^2-10x-21/32x^2-81 Tuesday, April 29, 2014 at 2:28pm CALCULUS HELP PLZ The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ... Tuesday, April 29, 2014 at 1:56pm Calculus How do you find the first and second derivative of the following function? P(t)=20/(1+3e^-0.02t) Monday, April 28, 2014 at 10:58pm Calculus The following are about an infinite region in the 1st quadrant between y=e^-x and the x-axis. B)Find the volume of the solid generated by revolving the region about the y-axis Part A was solved below. Does anyone know how to do Part B? Sunday, April 27, 2014 at 10:00pm Calculus The following are about an infinite region in the 1st quadrant between y=e^-x and the x-axis. A) Find the area of the region B)Find the volume of the solid generated by revolving the region about the y-axis Sunday, April 27, 2014 at 9:08pm CALCULUS two birds are flying along in 3-space. At time t, the first bird is at the point (x,y,z) on the line Sunday, April 27, 2014 at 2:33am CALCULUS Determine the intervals for which the curve r(t)=4sin^3(t)i + 7cos^3(t)j is smooth on [0,2pai] Sunday, April 27, 2014 at 2:09am Calculus Help Please Urgent!!! a) Estimate the area under the graph of f(x)=7+4x^2 from x=-1 to x=2 using three rectangles and right endpoints. R3= ??? Then improve your estimate by using six rectangles. R6= ??? Sketch the curve and the approximating rectangles for R3 and R6? b) Repeat part (a) using left ... Saturday, April 26, 2014 at 8:39pm Calculus Ian's house is located 20km north of Aida's house. At 9am, one saturday, Ian leaves his house and jogs south at 8km/hour. At the same time Aida leaves her house and jogs east at 6km/h. When are Ian and Aida closest together given that they both run for 2.5 hours? The ... Saturday, April 26, 2014 at 10:59am Calculus How fast must you release the string of your kite if the kite that you are flying is 40 meters high, 50 meters away from you and moving horizontally away at rate of 30 meters per minute? Friday, April 25, 2014 at 10:13pm Calculus Please Help4 Consider the area between the graphs x+2y=9 and x+6=y^2. This area can be computed in two different ways using integrals First of all it can be computed as a sum of two integrals as integral f(x)dx from a,b + integral g(x)dx from b,c I got a=-6 b=3 c=19 but what does f(x)=? g(... Friday, April 25, 2014 at 8:27pm Calculus Please Help3 Find the area of the region. 2y=3sqrtx, y=5 and 2y+2x=5 ty Friday, April 25, 2014 at 8:10pm Calculus Please Help2 Evaluate the integral by using substitution. Use an upper-case "C" for the constant of integration. integral x^5((x^6-2)^10)dx ty Friday, April 25, 2014 at 8:08pm Calculus Please Help integral t^2dt from x to x^2 f'(x)=? Friday, April 25, 2014 at 7:38pm calculus help A drinking cup is made in the shape of a right circular cylinder. for a fixed volume, we wish to make the total material used, the circular bottom and the cylindrical side, as small as possible. Find the ratio of the height to the diameter that minimizes the amount of material... Friday, April 25, 2014 at 6:33pm calculus help for f(x)= ln(x-3) on the interval [5,9], find c so that f'(c)= (f(b)-f(a))/(b-a) Friday, April 25, 2014 at 6:21pm calculus help Farmer Brown wants to fence in a rectangular plot in a large field, using a straight rock wall that is already there as the north boundary. The fencing for the east and west sides of the plot will cost$3 a yard, but she needs to use special fencing, which costs $5 a yard, on ... Friday, April 25, 2014 at 5:53pm calculus help At time t=0, an astronaut stands on a platform 3 meters above the moon's surface and throws a rock directly upward with an initial velocity of 32 m/sec. if the acceleration due to gravity is 1.6 m/sec^2. a) find the equations of motion for the throwing of this rock. -1. a(... Friday, April 25, 2014 at 5:48pm Locus- Calculus Find the equation of the locus of the point representing z if |z-5-12i| + |z-5+21i|=13 Friday, April 25, 2014 at 1:19am calculus help A drinking cup is made in the shape of a right circular cylinder. for a fixed volume, we wish to make the total material used, the circular bottom and the cylindrical side, as small as possible. Find the ratio of the height to the diameter that minimizes the amount of material... Thursday, April 24, 2014 at 10:28pm Calculus Help Farmer Brown wants to fence in a rectangular plot in a large field, using a straight rock wall that is already there as the north boundary. The fencing for the east and west sides of the plot will cost$3 a yard, but she needs to use special fencing, which will minimize the ...
Thursday, April 24, 2014 at 10:24pm

CALCULUS
A plane, flying horizontally at an altitude of 1 km and a speed of 500 km/hr, passes directly over a radar station. find the rate in km/hr at which the distance from the plane to the station is changing when it is 2 km away from the radar station. Hint: this is not a max/min ...
Thursday, April 24, 2014 at 10:22pm

At time t=0, an astronaut stands on a platform 3 meters above the moon's surface and throws a rock directly upward with an initial velocity of 32 m/sec. if the acceleration due to gravity is 1.6 m/sec^2. a) find the equations of motion for the throwing of this rock. b) how...
Thursday, April 24, 2014 at 10:19pm

Calculus
The velocity v (in m/s) of an object moving with acceleration a (in m/s^2) is given by v =ʃ a dt, where t is the time (in seconds). Find a formula for v, if a =(5/4t)(t^2+1)^2.
Thursday, April 24, 2014 at 2:03pm

Calculus
A real estate office manages 50 apartments in a downtown building. When the rent is $900 per month, all the units are occupied. For every$25 increase in rent, one unit becomes vacant. On average, all units require $75 in maintenance and repairs each month. How much rent ... Thursday, April 24, 2014 at 8:56am Calculus 1)A north south highway, intersects an east west highway, at point P. A vehicle process point P @ 1pm, traveling east at a constant speed of 60km/h. At the same instant another vehiclist 5km north of P, travelling south at 80km/h, find the time, when the 2 vehicles are closest... Thursday, April 24, 2014 at 8:53am math, calculus 1. Consider the region bounded by the curves y=|x^2+x-12|, x=-5, and x=5 and the x-axis. A. Set up a sum of integrals, not containing an absolute value symbol, that can be used to find the area of this region. B. Find the area of the region by using your answer from part A. ... Wednesday, April 23, 2014 at 11:36pm Calculus a) Estimate the area under the graph of f(x)=7+4x^2 from x=-1 to x=2 using three rectangles and right endpoints. R3= ???? Then improve your estimate by using six rectangles. R6= ????? Sketch the curve and the approximating rectangles for R3. Sketch the curve and the ... Wednesday, April 23, 2014 at 4:30pm calculus help Find f. f'(x) = 9/(square root of (1-x^2)) , f(1/2) = 1 f(x) = ?????? Wednesday, April 23, 2014 at 4:08pm calculus help A particle is moving with the given data. Find the position of the particle. a(t)= (t^2 - 5t +7) , s(0)=0 , s(1)=20 Thanks! Wednesday, April 23, 2014 at 4:05pm Calculus Use u-substitute to compute the following: A) ∫((x)/((x^2)+5)) dx B) ∫((sin(ln(x)))/(x)) dx Tuesday, April 22, 2014 at 9:35pm calculus help find the position function s(t) given acceleration a(t)=3t, if v(2)=0, and s(2)=1. the answer is s(t)=(t^3/2)-6t +9 but I don't know how to solve this. Can someone help me with this? Thank you! Tuesday, April 22, 2014 at 8:53pm Calculus At 8:00am, ship A is 120km due east of ship B. Ship A is moving north at 20km/hr, and ship B is moving east at 25km/hr. How fast is the difference between the two ships changing at 8:30am? Tuesday, April 22, 2014 at 6:00pm calculus x(t)=3t^3-40.5t^2+162t find where object is speeding up or slowing down Tuesday, April 22, 2014 at 4:01pm statistics We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year calculus course. What's the minimum sample size needed to construct a 95% confidence interval for a proportion with a margin of error of 2.5%? Tuesday, April 22, 2014 at 11:56am calculus help Suppose that f'(x)= (2x^2-5x-12)/(3x^2-7x+2) and that f(x) is continuous for all real numbers x. a) Do a sign diagram to list the values of x where f(x) has local maximums and local minimums. In addition, list the intervals where f(x) is increasing and decreasing. b) Draw ... Monday, April 21, 2014 at 6:52pm Calculus What is limit as x approaches 0 of x*(2^x)/((2^x)-1)) Monday, April 21, 2014 at 12:27pm Calculus Limit as x approaches (pi/2)^- of (x-pi/2)*secx Monday, April 21, 2014 at 12:26pm Calculus Limit as x approaches 0 of x(1-cosx)/t-sinx. Confused on how to get this answer. Monday, April 21, 2014 at 12:25pm Calculus Determine the behavior of limits A. Limit as x approaches 1 of: (log x)/((x-1)^2) B. Limit as x approaches infinity of: ((x-1)^2)/(log x)) Monday, April 21, 2014 at 9:44am Calculus Evaluate limit as x approaches 0 of: csc^2(7x)tan(2x^2) Monday, April 21, 2014 at 9:42am calculus u have 7 different pass codes from a choice of 8 numbers how many possible outcomes are there Sunday, April 20, 2014 at 2:04pm Calculus Help A high-speed bullet train accelerates and decelerates at the rate of 4 ft/s2. Its maximum cruising speed is 90 mi/h. (Round your answers to three decimal places.) (a) What is the maximum distance the train can travel if it accelerates from rest until it reaches its cruising ... Saturday, April 19, 2014 at 3:55pm calculus help What constant acceleration is required to increase the speed of a car from 22 mi/h to 50 mi/h in 3 s? (Round your answer to two decimal places.) Saturday, April 19, 2014 at 3:42pm calculus x^4 + 2x^2 + 1 = 0 (x^2)^2 +2x^2 +1 = 0 (x^2 + 1)^2 = 0 I don't know where to go now although I know the answer is x = i, -i Saturday, April 19, 2014 at 9:03am calculus Let f x   coth x . Use the Graph software posted in Moodle to do the following: (a) Graph f x  . (b) Graph the tangent and normal lines to the graph of f x  at x 1. (c) Graph f x  . (d) ... Saturday, April 19, 2014 at 3:19am Calculus Please Need Urgent3 :/ Find the derivative of the following function using the appropriate form of the Fundamental Theorem of Calculus. F(x)= (s^2)/(1+3s^4)ds from sqrtx to 1 F'(x)=? Thank you so much guys! Saturday, April 19, 2014 at 12:39am Calculus Please Need Urgent2 :/ Consider the function f(x) whose second derivative is f''(x)=8x+4sin(x). If f(0)=3 and f'(0)=2, what is f(x)? f(x)=?? Saturday, April 19, 2014 at 12:38am Calculus Please Need Urgent :/ Find the most general antiderivative of f(x)=–8e^x–6secant^2(x) where -pi/2<x<pi/2 Note: Any arbitrary constants used must be an upper-case "C". F(x)=? Saturday, April 19, 2014 at 12:37am Calculus Help Please! If f(x)=Integral (t^3+6t^2+4)dt from 0 to x then f''(x)=? Saturday, April 19, 2014 at 12:34am Calculus Help and Check 1)Find the most general antiderivative of the function. (Check your answer by differentiation. Use C for the constant of the antiderivative. Remember to use ln |u| where appropriate.) f(x) = (1/5)−(3/x) -----> (x/5)-3lnx+C 2)Find f. f ''(x) = 4 + 6x + ... Friday, April 18, 2014 at 10:47pm Calculus Help Please Urgent!!! A piece of wire 14 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. (a) How much wire should be used for the square in order to maximize the total area? 14 m this one I got right (b) How much wire should be used... Friday, April 18, 2014 at 6:57pm Calc Find the derivative of the following function using the appropriate form of the Fundamental Theorem of Calculus. intergral s^2/(1+3s^4) ds from sqrtx to 1 F'(x)=? Friday, April 18, 2014 at 4:37am Calculus Find the derivative of the following function using the appropriate form of the Fundamental Theorem of Calculus. intergral s^2/(1+3s^4) ds from sqrtx to 1 F'(x)=? Friday, April 18, 2014 at 4:34am calculus A bug crawls along the graph of 2 y x x    4 1 , where x and y are positive and measured in centimeters. If the x-coordinate of the bug’s position x y,  changes at a constant rate of 3 cm/min, how fast is the y-coordinate changing ... Friday, April 18, 2014 at 3:48am calculus A person 150cm tall is walking away from a lamp post at the rate of 15 meter per minute. when the man is 2.5m from the lamp post, his shadow is 3m long. Find the rate at which the length of the shadow is increasing when he is 7m from the lamp post. Friday, April 18, 2014 at 1:09am Calculus Given f(3)=4 and f'(3)=5, find g'(3), where g(x)=8x.f(x) Thursday, April 17, 2014 at 1:17pm Calculus An open top box with a square base is to be made so that it holds 3 cubic feet. Assuming the material on the base costs$3 per square foot and the material on the sides costs \$2 per square foot, determine the size of the base that minimizes the total cost.
Wednesday, April 16, 2014 at 11:09pm

CALCULUS
The base of S is a circular disk with radius 3r. Parallel cross-sections perpendicular to the base are isosceles triangles with height 8h and unequal side in the base. a. set up an interval for volume of S b. by interpreting the intergal as an area, find the volume of S
Wednesday, April 16, 2014 at 9:49pm

calculus help
find y' and y'' for the equation below. Show work please!!! y= (x^3)/((x+1)^2)
Wednesday, April 16, 2014 at 6:53pm

calculus help
Produce graphs of f that reveal all the important aspects of the curve. Then use calculus to find the intervals of increase and decrease and the intervals of concavity. f(x)= 1+(1/x)+(5/x^2)+(1/x^3) find the interval of increase. find the interval of decrease. find the ...
Wednesday, April 16, 2014 at 5:37pm

calculus help check and help
if an object with mass m is dropped from rest, one model for its speed v after t seconds, taking air resistance into account is v= mg/c(1-e^(-ct/m)) where g is the acceleration due to gravity and c is a positive constant describing air resistance. a) calculate lim t->...
Wednesday, April 16, 2014 at 5:01pm

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